Snowplow



3 Sheets-Sheet 1 SNOWPLOW MATTORNEYS' Fifi? D. A. SARGENT Filed April28, 1925 Aug. 18, 1925.

Aug. 18, 1925.

D. A. SARG ENT S NOWPLOW Filed April 28, 1925 3 Sheets-Sheet 2 INVE TOR41% A; ATTORNEYS I Aug. 18, 1925.

- D. A. SARGENT SNOWPLOW' 5 Sheets-Sheet 5 Filed April 28 lll l .rllllll.IIIII M ATTORNEYS Y Mwil,

Patented Aug. 18, v1925.

UNITED STATES A 1,550,575 PATENT OFFICE- DON SARGENT, F BANGOR, MAINE,ASSIGNOR T0 NORTHERN TRAILER COMPANY, OF BANGOR, MAINE, A CORPORATION OFMAINE.

SNOWPLOW.

, Application filed April 28, 1925. Serial No. 26,330.

To all whom it may concern:

Be it known that I, DON A. SARGENT, a citizen of the United States,residing at Banor, in the county of Penobscot, State of ila1ne,'haveinvented certain new and useful Improvements in Snowplows; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same. f

This inventionrelates to snow plows of the tractor-driven type and moreparticularly to means for raising and lowering the nose and wings.-

In my copending application, Serial No. 658,485 filed August 21, 1923, Ihave illustrated and described a snow plow comprising a plow-carryingframe designed to sur round a tractor and pivotally mounted onsupporting sled runners. The nose, or plow proper, israised or loweredby swinging the frame up or down on the sled runners by means of a pairof levers fulcrumed on the sled, one on each runner, pivotally connectedto the frame at their forward ends, and extending rearwardly. Theselevers are designed for manual operation and therefore requiretwo menfor best results. The plow of this earlier application is also providedwith a.pair of wings or auxiliary plow members, one on each side of theplow, mounted upon the frame just behind the nose for universal swingingmovement. These wings are swung upwardly by means of a pair of separatemanually operated chain falls, one for each wing, and held in lateraladjustment by means of adjusting bars or struts.

It is the object of the present invention to improve upon these priormeans for raising and lowering both the nose and the win of a snow plow.In attaining this object I ave provided four fluid-actuated liftingmeans, one for each side of the nose and. one for each wing, operablefrom a centrally located point, as for instance, the cab of the tractor.The two wing lifting means can be separately operated so that each wingcan be raised or lowered independently, but the two lifting means forthe nose are designed to be operated simultaneously by the same controlso that both sides of the nose shall always be raised or loweredtogether and without likelihood of twisting, tilting or binding.

the plow shown in Figure 1, F i ure 4 is a rear elevation of the sameplow, igure 5 is a diagrammatic layout of the fluid pressure system andits controls, Figure 6 isan enlarged detail of one of the win raisingand lowering mechanisms, F i 'ure is a section taken along line 7-7 ofFigure 6, and Figure 8 is a detail showing the relation between the twoupper sheaves shown in F igures 6 and 7.

The plow illustrated in these drawings is fundamentally the same as theone described in my copending application Serial No. 658,485. Itcomprises a V-shaped'nose or plow proper 1, fixed to and carried by arearwardly extending frame comprising side members 2 and a removabledraft bar 3 designed to enclose a tractor 4, preferably of thetraction-belt type. Within this frame is situated a sled having siderunners 5 connected at their forward ends by means of a cross-bar 6. Theside members of the frame arepivoted to the sled at the points 7 so thatthe frame and nose can be pivoted relative to the sled and the noseraised and lowered in consequence. Just behind the nose, on

.each side of the frame, a wing or auxiliary plow member 8 isniou-nted-for lateral vertical adjustment, in a manner which will bedescribed later.

I shall now describe, with particular reference to Figures 1 and 2, themechanism for pivoting the frame upon the sled and thereby raising andlowering the nose of the plow. Near the forward endof each sledrunner 5,lever 10 is fulcrumed upon a link 11. The forward end of this lever issecured to the side member 2 by means of a bracket 12. The rear end ispivotally connected to a lpiston rod 13, of a piston 14,, mounted wit ina cylinder 15, which cylinder is provided with a trunnion 16, journalledwithin a frame 17 secured to the side of the member 2. By admittingfluid under pressure to the cylinder 15, the piston 14 and piston rod 13are moved downward, and the frame and nose of the plow are moved upwardrelative to the forward end of the sled.

I shall now describe, with partic'ular reference to Figures 4, 6, 7 and8, the mechanism employed for raising and lowering the Wings 8. Mountedupon the rear end of each side member 2 of the frame is a doiibleupright 18, these uprights being connected by means of a horizontalcross-bar 19. On each of these uprights 18 is mounted a cylinder 21having a piston 22 and a piston rod 23 terminating in a cross-head 24slidable in ide-ways 25. Mounted near the top of upright 18 is a sheave26 lying in a plane transverse to the direction of movement of the plow,and just below this sheave, at right-angles thereto, is a second sheave27. Two additional sheaves 28 and 29 are carried by the cross-head 24and move with it. A chain 31 is secured to each wing 8 near the outerend thereof and extends upward over sheave 26, then downward aroundsheave 28, up again around sheave 27, down again around sheave 29 and upto anchor bolt 32 on cross-bar 19. The admission of fluid under pressureto the cylinder 21 causes a downward movement of the. piston 22, pistonrod 23, cross-head 24 and the two sheaves 28 and 29, which in turnresults in an inward pull on the chain 31 and a movement of the winginwardly and upwardly. The position of each wing is also determined bymeans of a telescoping supporting bar or strut 33 pivotally mounted atone end to the outer end of the wing and at the other end to an upright18.

I shall now describe, with particular ref- .erence to Figures 4 and 5,the mechanism for applying and controlling the fluid pressure whichactuates the levers 10 and the chains 32. The fluid which I prefer touse is oil. The oil supply is maintained within a tank 35, whence itpasses through a suction pipe 36 to a pump 37 thence through a dischargepipe 38 to a header 39, and

thence through a pipe 41 to the cylinders 15 which control the movementof the nose and through pipes 42 and 43 to the two cylinders 21 whichcontrol the raising and lowering ofv the wings. The pipes 42 and 43 passdirectly to their respective cylinders, whereas the pipe 41 connectswith a common crossipe 44 which leads directly to both cyliners 15, thusmaintaining an equal pressure in each. The pump 37 is equipped with aby-pass containing a pressure regulating valve 45, the operation ofwhich is well understood. The pipes 36 and 38 are connected by means ofa shunt pipe 46 controlled b means of a three-wa valve 47 situated inthe pipe 38. The pipes 41, 42 and 43 are also connected to the suctionpipe 36 by means of return ipes 48, 49 and 50 respectively, controlled ythree-way valves 51, 53 and 52 respectively. The oil tank and pump arepreferably situated at the rear of the tractor and the control valves47, 51, 52 and 53, within the cab, as illustrated in Figure 4. r

I shall now describe the operation of my improved mechanism for raisingand lowering the nose and the wings, explaining how the illustratedpressure control s stem functions to. this end. The pump, riven pref;erably from the engine of the tractor, oper ates continuously. When thelifts are not in use the valve 47 is turned so that oil circulatesfreely from the pump through pipe header 39, thus relieving the pump ofback pressure. When the lifts are to be operated, the valve 47 is turnedto close pipe 46 and permit oil to flow to theheader 39 and thence tothe pipes 41, 42 and 43. When the nose is to be elevated, the three-wayvalve 51 is turned to permit oil to flow directly through the pipe 41 tothe cross,- pipe 44, and to close pipe 48; When the desired elevationhas been reached, the valve is turned to shut off pipe 41 from the restof the system and thus maintain the established pressure within thecylinders 15., When the nose is to be lowered, the valve 51 is againmoved to connect the pipe 41 with the exhaust pipe 48, whereupon thedownward pressure of the nose itself will force the oil out of cylinders15 and back into tank 35. The operation of cylinders 21 is identicalwith this. It is to be observed, however, that cylinders 21 can beindependently operated, whereas the two cylinders 15 are operatedtogether.

By means of the mechanism illustrated and described above, I am enabledeffectively and quickly to control the positions of the nose and thewings by manipulation of the valves 51, 52 and 53 all centrally locatedwithin the cab of the tractor and easily reached. Each wing may beindependently controlled, whereas the two cylinders which control thenose are operated in unison, and being situated one on either side ofthe frame insure an even and steady swinging movement of the nose.

I claim:

1. A snow plow comprising the cornbination of a sled, a frame pivotallymounted on the said sled for movement in a vertical plane, a nosesecured to the frame, and means mounted on each side of the frame forpivoting the frame upon the sled'to raise and lower the nose, and meansfor simultaneously operating each-pivoting means.

2. A. snow plow comprising the combination of a sled, a framepivotallyvmounted on the said sled for movement in a vertical plane,

a nose secured to the frame, fluidoperated means mounted on each side ofthe frame for pivoting the frame upon the sled to raise and lower thenose, a common source of fluid pressure, and a common control means forboth pivoting means.

3. A snow plow comprising the combination of a sled, a frame pivotallymounted near the rear end .of the sled for movement in a vertical plane,a nose secured to the frame, two levers, one fulcrumed near the forwardend of each sled runner and con- .nected to the frame, andfluid-operated means connected to each lever for swinging the levers andpivoting the frame upon the sled to raise and lower the nose.

f. A snow plow comprising the combination of a sled, a frame pivotallymounted near the rear end of the sled for movement in a vertical plane,a nose secured to the frame, two levers, one fulcrumed near the forwardend of each sled runner and connected to the frame, fluid-operated meansconnected to each lever for swinging the levers and pivoting the frameupon the sled to raise and lower the nose, a common source of fluidpressure and a common control means for both fluid operated means.

5. A snow plow comprising the combination of a sled, a frame pivotallymounted near the rear end of the sled for movement "in a vertical plane,a nose secured to the frame, two levers, one fulcrumed near the forwardend ofeach sled runner and connected to the frame, and a fluid-operatedpiston connected to each lever for swinging the levers and pivoting theframe upon the sled to raise and lower the nose.

6. A snow plow comprising the combination of a sled, a frame pivotallymounted near the rear end of the sled for movement in a vertical plane,a nose secured to the frame, two levers, one fulcrumed near the forwardend of each sled runner and connected to the frame, a, fluid-operatedpiston connected to each lever for swinging the levers and pivoting theframe upon the sled to raise and lower the nose, a common source offluid pressure for each piston and a common control means.

7 In a snow plow, the combination of a sled, a plow nose, a leverfulcrumed' on the sled and connected at one end to the nose to raise andlower the nose relative to the sled,

a cylinder, a piston in the cylinder connected to the other end of thelever, and a source of fluid pressure for the cylinder.

8. In a snow .plow the combination of a sled, a frame, a plow nosesecured to the frame, a lever fulcrumed on the sled and connected at oneend to the frame to raise and lower the nose relative to the sled, acylinder pivotally mounted on the frame, a piston in the cylinderconnected to the other end of the lever, and a source of fluid pressurefor the cylinder.

9. A snow plow comprising the combination of a nose, a rearwardlyextending frame, a wing pivotally mounted upon the frame behind thenose, an upright on the rear of the frame, a cylinder mounted on theupright, a piston in the cylinder, a pulley on the piston, a chainextending from the wing to the upright and passing around the pulley onthe piston, and a source of fluid pressure for the cylinder.

' 10. A snow plow comprising the combination of a nose, a rearwardlyextending frame secured thereto and designed to receive a tractor, asupporting sled to which the frame is pivotally connected,fluid-operated means mounted on each side of the frame for pivoting theframe upon the sled to raise and lower the nose, Wings pivotallymounted, one upon each side of the frame behind the nose, fluid-operatedmeans for pivoting each wing, a common source of fluid pressure, andcentrally located control means.

11. In a snow plow having plow members adapted to be raised and lowered,the combination of an oil-operated system for effecting this raising andlowering comprising the combination of a cylinder controlling a plowmember an oil supply tank, a pump, a suction pipe leading from the tankto the pump, a discharge pipe leading from the pump from the dischargepipe to the suction pipe, and a three-way valve situated at the junctionof the discharge pipe and the return In testimony whereof I aflix mysignature.

DON A. SARGENT.

to the cylinder, a return pipe. leading

